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Commit cde46035 authored by Frank Blaschka's avatar Frank Blaschka Committed by Jeff Garzik
Browse files

qeth: enforce a rate limit for inbound scatter gather messages 



under memory pressure scatter gather mode switching messages must be
rate limited.

Signed-off-by: default avatarFrank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: default avatarUrsula Braun <braunu@de.ibm.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent d0a34f98

drivers/s390/net/qeth_main.c

+8 −5
Original line number Diff line number Diff line
@@ -2803,13 +2803,16 @@ qeth_queue_input_buffer(struct qeth_card *card, int index) 
		if (newcount < count) {

			/* we are in memory shortage so we switch back to

			   traditional skb allocation and drop packages */

			if (atomic_cmpxchg(&card->force_alloc_skb, 0, 1))

				printk(KERN_WARNING

					"qeth: switch to alloc skb\n");

			if (!atomic_read(&card->force_alloc_skb) &&

			    net_ratelimit())

				PRINT_WARN("Switch to alloc skb\n");

			atomic_set(&card->force_alloc_skb, 3);

			count = newcount;

		} else {

			if (atomic_cmpxchg(&card->force_alloc_skb, 1, 0))

				printk(KERN_WARNING "qeth: switch to sg\n");

			if ((atomic_read(&card->force_alloc_skb) == 1) &&

			    net_ratelimit())

				PRINT_WARN("Switch to sg\n");

			atomic_add_unless(&card->force_alloc_skb, -1, 0);

		}



		/*